Forcing usage of boost v1.85 in "windows-2019" runner of github actions.

Author: arobenko

.github/workflows/actions_build.yml

@@ -554,6 +554,7 @@ jobs:
         QT_VER: ${{matrix.qt_ver == '5' && '5.15.3' || '6.2.2'}}     
 
     - name: Install Boost
+      if: matrix.arch == 'x64'
       shell: cmd
       run: |
         choco install boost-msvc-14.2 --version=1.85.0          
@@ -584,9 +585,11 @@ jobs:
           -DCMAKE_PREFIX_PATH="${{runner.workspace}}/build/install;${{env.QTDIR}}" ^
           -DCMAKE_POLICY_DEFAULT_CMP0167=OLD -DBoost_USE_STATIC_LIBS=ON ^
           -DCMAKE_CXX_STANDARD=${{matrix.cpp}} -DDEMO3_TOOLS_QT_VER=${{matrix.qt_ver}} ^
-          -DDEMO3_GEN_PROTOCOL=ON -DDEMO3_GEN_TEST=ON -DDEMO3_GEN_TOOLS=ON -DDEMO3_BUILD_TOOLS=${{env.BUILD_TOOLS}}
+          -DDEMO3_GEN_PROTOCOL=ON -DDEMO3_GEN_TEST=ON -DDEMO3_GEN_TOOLS=ON -DDEMO3_BUILD_TOOLS=${{env.BUILD_TOOLS}} ^
+          -DDEMO3_BUILD_EXAMPLES=${{env.HAS_BOOST}}
       env:
         BUILD_TOOLS: "${{ matrix.cpp >= 17 && matrix.arch == 'x64'  && 'ON' || 'OFF' }}"
+        HAS_BOOST: "${{ matrix.arch == 'x64' && 'ON' || 'OFF' }}"          
 
     - name: Build Target 
       working-directory: ${{runner.workspace}}/build